Getting referred for a sleep study is the right next step if your STOP-BANG score is elevated or you have symptoms. Here's what the process looks like — from the first doctor visit through the night of the study — and how to make every step count.
Most sleep studies begin with a referral from your primary care physician, who will then refer you to a sleep specialist (sleep medicine physician, pulmonologist, or neurologist with sleep training).
To get the most out of this appointment, arrive with:
Depending on your presentation, your doctor may order one of two types of study:
The gold standard. You sleep at a sleep clinic while technicians monitor: brain waves (EEG), eye movements (EOG), muscle activity (EMG), heart rhythm (ECG), airflow, respiratory effort, blood oxygen, and leg movements. Full diagnostic picture.
Best for: Complex presentations, suspected non-OSA sleep disorders (narcolepsy, RLS, parasomnias), or when home testing is inconclusive.
A portable device you take home that monitors airflow, oxygen saturation, and respiratory effort. Simpler, cheaper, and more comfortable than in-lab. FDA-cleared and covered by most insurance for straightforward OSA screening.
Best for: High clinical suspicion of uncomplicated OSA without other suspected sleep disorders. Results in 1–2 days.
Limitation: If the HSAT is negative but suspicion remains high, a full PSG is still recommended — home tests can miss OSA in some body positions or movement patterns.
Setup takes 45–90 minutes. A technician will attach electrodes to your scalp, face, chest, and legs using a conductive paste or adhesive. Belts around your chest and abdomen measure breathing effort. A small probe on your finger measures oxygen saturation. A cannula under your nose measures airflow.
You'll sleep with all of this on. Most people sleep well enough for a valid study — you don't need to sleep a full 8 hours for the study to be diagnostic.
The key number from your sleep study is the Apnea-Hypopnea Index (AHI) — the average number of breathing events per hour of sleep:
| AHI | Severity | Typical Treatment |
|---|---|---|
| 0–4 | Normal | Lifestyle modifications if symptomatic |
| 5–14 | Mild OSA | Position therapy, weight loss, possibly oral appliance |
| 15–29 | Moderate OSA | CPAP (first-line), oral appliance |
| 30+ | Severe OSA | CPAP strongly recommended |
Ask your sleep physician: "What was my oxygen nadir?" (the lowest SpO₂ reading during the night) and "How fragmented was my sleep architecture?" These numbers tell you how severely your sleep is being disrupted — AHI alone doesn't capture the full picture.
CPAP (Continuous Positive Airway Pressure) is highly effective — it essentially eliminates obstructive apneas for most patients. The challenge is adherence. Tips that significantly improve compliance:
Come to your appointment with a structured STOP-BANG score and Mallampati class. The Axion Sleep Apnea Screener generates a clinical PDF you can share with your physician.
Learn About the Screener →For informational purposes only. Not medical advice. Sleep study interpretation and treatment decisions should be made by a qualified physician.